Schaefer HotZone HZE & HZS Series Electric Spot Heater

Transcription

1 Schaefer HotZone HZE & HZS Series Electric Spot Heater High Output Infrared Heater INSTALLATION & OPERATION INSTRUCTIONS ** HOTZONE HEATERS MUST BE INSTALLED BY A LICENSED ELECTRICIAN. ** HZE Series HZS Series always install heater with the junction box on the low side sales@schaeferfan.com

2 Table of Contents INTRODUCTION...3 OPERATINg NOTES CLEARANCE TO COMBUSTIBLES...6 HZE SERIES MOUNTINg OPTIONS...7 MOUNTINg INSTRUCTIONS...8 ELECTRICAL CONNECTION...9 ANgLE ADJUSTMENT...9 ELEMENT REPLACEMENT HZS SERIES MOUNTINg OPTIONS...11 ELECTRICAL CONNECTION...11 ANgLE ADJUSTMENT...12 ELEMENT REPLACEMENT...12 MAINTENANCE AND TROUBLESHOOTINg...13 REPLACEMENT ELEMENTS...14 CALCULATINg CURRENT REQUIREMENT...15 HZE & HZS Series Control Options A number of control options are available that can enhance the performance and enjoyment of your HotZone heater. Contact your local licensed electrician for more information. ON/Off SwITCHES STAgINg Control single or multiple heaters using direct connections or relays. Switches that turn on parts of the heater individually or parts of the service to multiple heaters for times of lower heat requirements. DIMMERS Continuous control or "dimming" of heater from 100% down to 0%. THERMOSTATS TIMERS Used to automatically turn heater on or off at specific temperatures. Used to automatically turn heater on or off at specific times. ETL Label 2

3 Introduction Congratulations on purchasing a Schaefer HotZone electric infrared Heater. Unlike forced air heaters, HotZone heaters warm people and objects, but not the air, with infrared radiation. your new heater has no moving parts, and should give you many years of maintenance-free comfort. HotZone heaters have the patented, lobster eye inspired, compound reflective irlens that focuses and directs the infrared energy into a beam (or a spot). these lenses are lightweight aluminum grids that look like a four-walled honeycomb structure and are capable of focusing the infrared energy without overheating. because HotZone heaters focus and direct the infrared energy into a beam: HotZone heaters can be installed out of the way of people and equipment. the radiant intensity is much less sensitive to distance from the heater (your head doesn't cook while your feet freeze). they deliver up to five times as much infrared energy to the spot, compared to similar powered, unfocused high intensity infrared heaters. they will raise the surface temperature of a 14 square foot area by 15 with a single 1500 watt heater mounted eight feet above it. they will raise the surface temperature of a 25 square foot area by 20 with a single 3000 watt heater mounted ten feet above it. Plan your installation by identifying the area you want heated and how much temperature increase you need. imagine the heater as a kind of floodlight and place it so as to cover your target area with enough heat. the temperature increase resulting from the heater "shining" on a target depends on the power of the heater, the distance from the heater to the target and how close the target is to the center of the spot. do not allow the heater to be aimed at a wall or any other combustible material. the heater unit with fixed mount is etl certified to Ul 2021 (Fixed and location dedicated electric room Heaters) for installation both indoors and outdoors. warning the safety of this product can only be guaranteed if these instructions are followed. Please keep them for future reference. Always disconnect the heater from the main electrical supply during installation and/or replacement of the heater element. Infrared energy heats people and objects when it is absorbed. Flammable objects placed too close to the heater lens could catch fire. CAUTION ** HotZone HeAterS must be installed by A licensed electrician ** 3

4 HZE & HZS Series Operating Notes * IMPORTANT INSTRUCTIONS * when using electrical appliances, basic precautions should always be followed to reduce the risk of fire, electric shock, and injury to persons, including the following: 1. read all instructions before assembling, installing and using this heater. 2. this heater is hot when in use. to avoid burns, do not let bare skin touch hot surfaces. Keep combustible materials, such as furniture, pillows, bedding, paper, clothes and curtains at least 48" (1500 watt) / 66" (3000 watt) / 96" (5000 watt) from the front of the heater and keep them away from the sides and rear. Do not install closer than the minimum clearances to any surface. 3. extreme caution is necessary when any heater is used by or near children or persons that may not have reasonable judgement around appliances. the heater should not be left unattended while operating. 4. if heater has a cord and plug, always unplug when not in use. 5. do not operate any heater with a damaged cord or plug (if applicable) or after the heater malfunctions, or has been dropped or damaged in any manner. return heater to dealer for examination, electrical or mechanical adjustment, or repair. 6. this heater is not intended for use in bathrooms, laundry areas and similar indoor locations. never locate heater where it may fall into a bathrub or other water container. 7. if heater has a cord, do not run cord under carpeting. do not cover cord with throw rugs, runners or similar coverings. Arrange cord away from traffic area and where it will not be tripped over. 8. to disconnect heater, turn control off (if provided), then remove plug from outlet (if applicable). 9. if heater has a cord and plug, connect to properly grounded outlet only. the heater should always be connected to a grounded circuit. if a GFCi socket is not available, GFCi adapters can be purchased locally. Heater must be installed according to nec and all local electrical codes. be sure the electrical supply is adequate for the heater (voltage/amps/phase) while allowing for line losses. Use supply wires suitable for 90 C. 10. do not insert or allow foreign objects to enter the heater or block any ventilation openings as this may cause an electric shock or fire, or damage the heater. do not cover or obstruct the heater while operating. 11. A heater has hot and/or arcing and/or sparking parts inside. do not use it in areas where gasoline, paint, flammable liquids or highly combustible dusts are used or stored. 12. Use this heater only as described in this manual. Any other use not recommended by the manufacturer may cause fire, elecric shock, or injury to persons. 13. if heater has a cord and plug, avoid the use of an extension cord because the extension cord may overheat and cause a risk of fire. However, if an extension cord must be used, please contact your local licensed electrician for a safe recommendation based on heater voltage, wattage and cord length. Heaters rated 120 volts will require appropriate gauge three-wire cord with grounding type plug and cord connector. 14. if the unit is installed in proximity of tents or awnings, make sure that recommended installation heights and clearances are respected, and that the heater is not in direct contact with the tent or awning material. 15. Allow for user angle and directional adjustment, if possible, as heating requirements change. the optimal mounting angle is between directly down and 45. Comfort is best obtained with the heater off to one side and angled at 35. install heaters so that items in the infrared beam do not overheat. 4

5 HZE & HZS Series Operating Notes cont'd 16. burned-out elements cannot be repaired and must be replaced. the element can be replaced by the user; please follow the instructions provided. Always disconnect the heater from the main electrical supply during installation and/or replacement of the heater element. 17. to prevent a possible fire and to increase the life of the heater, always install HZS Series heaters with the internal junction box on the low side. Failure to mount the heater with the junction box on the low side may void the warranty. 18. After the heater is installed and power is turned on, the element should begin glowing within 20 to 30 seconds and glow a uniform red-orange color within two to three minutes. If it begins glowing more quickly or glows very brightly, turn the heater off immediately and re-check the supply voltage. 19. the heater will smell very hot for the first few minutes of operation, then will stop emitting an odor. 20. the HotZone heating element operates at approximately 1800 F. the element is resistant to thermal and mechanical shock, and is appropriate for use in both wet and dry locations only if permanently mounted on a junction box. 21. the element has an expected life of 2000 hours. When an element burns out, it cannot be repaired and must be replaced. For replacement, have your heater model number available and call your Schaefer HotZone dealer to order the correct element. 22. if the position of the heater needs to be adjusted after it is attached to the mount, be very careful. DO NOT GRAB THE HEATER HEAD AND TWIST! the heater can be adjusted up and down, but it cannot be adjusted from side to side. * SAVE THESE INSTRUCTIONS * CAUTION ** do not USe this HeAter For APPliCAtionS For WHiCH it is not intended ** HotZone heaters are intended for heating people or objects from a distance in excess of the minimum distance to combustibles. Use of the heater for applications such as paint drying or equipment heating from a short distance where infrared energy will reflect back toward the heater will overheat the element, causing early element failure and negating the warranty. CAUTION ** do not USe this HeAter AS A PortAble HeAter ** HotZone heaters are designed, listed and approved as fixed and location-dedicated heaters. If the heater is used as a portable heater there is a great risk of fire and/or heater damage if the heater is placed too close to combustibles or if the heater tips over. 5

6 HZE & HZS Series Clearance to Combustibles NOTES mount the heater at or above the MINIMUM MOUNTINg HEIgHT. make sure the MINIMUM DISTANCE TO COMBUSTIBLES is maintained around and below the heater. the bulk of the heat radiates from the lens of the heater and care must be taken to keep combustibles out of the COMBUSTIBLE AVOIDANCE ZONE of the beam. At minimum distance to combustibles heaters will not raise the temperature of a highly absorptive surface more than 90 F. the minimum distances around the heater are not as critical as the combustible avoidance zone below the heater. do not allow the heater to be aimed at a wall or any other combustible material. HZX15 HZX30 HZX50 Mounting Angle MINIMUM MOUNTINg HEIgHT 72" 72" 72" 72" 96" 96" MINIMUM DISTANCE TO COMBUSTIBLES (around heater) Above 6" 6" 9" 9" 12" 12" Back 9" 9" 18" 18" 30" 30" front 9" 30" 18" 41" 30" 59" Side 9" 9" 18" 18" 30" 30" Below (in beam) 48" 48" 66" 66" 96" 96" DIAMETER Of COMBUSTIBLE AVOIDANCE ZONE (below heater) Distance from lens 12" 26" 32" 38" 24" 36" 42" 48" 36" 46" 52" 58" 48" 56" 62" 68" 60" 72" 78" 72" 82" 88" 84" 98" 96" 108" COMBUSTIBLE AVOIDANCE ZONE CAUTION ** DO NOT LEAVE HEATER OPERATING UNATTENDED ** ** DO NOT INSTALL THIS HEATER ABOVE FLAMMABLE MATERIAL ** the elements in HotZone heaters will eventually fail, much like a light bulb will eventually fail. When a heater element fails, extremely hot material may be ejected from the heater and this material can damage or ignite materials under the heater. to avoid these dangers, do not install heaters directly above flammable materials or materials that can be damaged by hot materials, do not leave the heater operating unattended, and replace elements before they fail. 6

7 there are three standard mounting configurations for HZe Series heaters and one that must be purchased separately. HZE Series Mounting Options the angle adjustment assembly on the back of the heater is designed for mounting flexibility, but the correct configuration should be determined before the heater is attached to the universal fixed mount. Figure 1 1 Heaters to be mounted on the wall should have the angle adjustment assembly attached below the center of the heater (standard configuration - Figure 1). 2 Heaters to be mounted on the ceiling and aimed sideways should have the angle adjustment assembly attached above the center of the heater (standard configuration, heater mounted "upside down" - Figure 2). 3 Heaters to be mounted on the ceiling and aimed down should have the angle adjustment assembly attached in the center of the heater (assembly needs to be reversed - Figure 3 - heater cannot adjust far enough without reversing). Figure 2 Figure 3 REVERSINg THE ANgLE ADJUSTMENT ASSEMBLY for CEILINg MOUNT Save all hardware for re-use! 1. remove the two cap screws from the back of the heater, which are holding the louvered element tray in place. 2. Slide the element tray out of the heater. Pull the high temperature element wires through the hole in the angle adjustment assembly to free the element remove the two allen screws that attach one end of the curved mounting plate to the heater. 4. remove the two allen screws that secure the other end of the curved mounting plate, internal ring clamps and angle adjustment assembly to the heater. detach the ground wire as well. 5. reverse the orientation of the curved mounting plate and angle adjustment assembly. 6. re-attach the curved mounting plate, ring clamps and angle adjustment assembly to the heater. re-attach the ground wire a 6b 7 7. Feed the high temperature element wires through the angle adjustment assembly and slide the element tray back into the heater. Fasten the element tray to the heater. fixed wall MOUNT An optional fixed wall mount is available from your Schaefer HotZone dealer. this mount consists of a three-position bracket that attaches to a post or wall, and the heater plugs into an outlet located nearby. Additional assembly instructions are provided with the mount. 7

8 HZE Series Mounting Instructions NOTE: Does NOT include hardware (screws) for attaching the universal mounting plate to the junction box. Tools required: UNIVERSAL fixed MOUNT #2 Phillips head screwdriver tools required to attach universal mounting plate to junction box 1. turn off supply voltage to the junction box at the panel. 2. thread the supply wires through the hole in the center of the universal mounting plate. orient the universal mounting plate so the four cover plate mounting holes are on the sides, not the top and bottom. Attach the universal mounting plate to the junction box with appropriate user-supplied screws. For additional support, secure the mounting plate to the ceiling or wall using appropriate screws (not provided) at the corners of the universal mounting plate. NOTE: If the heater is to hang from the ceiling, refer to the Angle Adjustment instructions to reverse the angle adjustment assembly before continuing. 3. thread the lead wires from the heater through the appropriate tube (provided - choose the 8" tube for ceiling mount; 4" tube for wall mount) and then through the stub in the cover plate. 4. Secure the tube to the heater stub with a trilobal screw (provided). Secure the tube to the cover plate stub with the remaining trilobal screw. 5. recruit an assistant to hold the heater. you may need to cut the clips off the ends of the lead wires and strip them to accommodate wire nuts. Use wire nuts to connect the lead wires from the heater to the power supply. be sure the lead wire with the green label is connected to the green (ground) power supply wire. 6. lift the heater up to the universal mounting plate and carefully coil the wires and connections into the junction box. Secure the cover plate to it with the four screws (provided). Be sure all screws are secure and sufficient to hold the weight of the heater. If any mounting hardware is loose or insufficient the heater may fall. 7. turn on the power supply and test operation. this mount attaches the heater to a junction box in the ceiling or wall. to mount directly to a wall (not to a junction box) optional accessories are required. Choose a location that meets or exceeds the minimum distance to combustibles on all sides and in front of the heater. mount the heater at least 72" above the ground. refer to CLEARANCE TO COMBUSTIBLES. 8

9 HZE Series Electrical Connection All wiring must be in accordance with the national and local electrical Codes. the heater housing must be properly grounded. install circuit protection for each heater or bank of heaters as required. ** Always be sure the supply voltage is turned off to the junction box before starting installation. ** 1. Connect the service to the heater with properly sized conductors and wire nuts rated for 90 C. 2. Use waterproof conduit or flex if installed outdoors or in wet areas as needed. 3. Connect service to the high temp wires according to the appropriate wiring schematic on page Supply heater control equipment as required to turn heaters on and off, to allow each heater to be staged for low/high voltage operation, to be dimmed, or to be controlled by sensors or timers. 5. be sure you are supplying the correct voltage to the heater, allowing for line losses. the heater's voltage requirements are marked on its shipping box and on its etl certification label. Too much voltage will burn the heater element out immediately. Too little voltage or inadequate current capacity will cause the heater element to run cool, and can cause the supply circuit to overheat dangerously. the angle adjustment assembly has approximately 40 degrees of motion, which allows the heater to be aimed at the desired target. the angle of the heater can be adjusted up and down only. be sure to loosen the allen screws before moving the heater, and then tighten them just enough to hold the unit in place. Overtightening can bend the frame and damage the unit. HZE Series Angle Adjustment HZE Series Element Replacement HZE SERIES ELEMENT REPLACEMENT Always disconnect the heater from the main electrical supply during installation and/or replacement of the heater element. Figure 1 - High-temp lead wires exit mounting stub. 1. turn off the power supply at the panel. 2. Carefully remove the heater from the mount and disconnect the power supply wires. the original white high-temperature lead wires should be coming out through the mounting stub. (Figure 1) ** Be sure to save all hardware for re-use! ** 3. Place the heater on a level, flat surface. be careful not to bend the lens (lay the heater on a soft or padded surface, such as a folded towel or bubble wrap). (Continued on next page) 9

10 HZE Series Element Replacement cont'd 4. remove the two allen screws that hold the element frame in place. (Figure 2) Figure 2 - Two allen screws hold element frame in housing. 5. Carefully slide the element frame out to one side. notice the high temp wires are being pulled through the mounting stub; feed them out as they are pulled by the frame. (Figure 1 and Figure 3) 6. lay the element frame as flat as possible next to the heater (still attached by the lead wires). (Figure 4) 7. disconnect the lead wires from the ring terminals on the used element. Do not lose the hardware! (Figure 5) Figure 3 - Element in frame slides in/out of housing. 8. loosen the four screws that hold the element in the frame. remove the used element. Be careful not to knock off, puncture or lose the four insulating pads on the element wrap. (Figure 4) 9. remove the single screw that holds the element wrap in place. remove the old element from the wrap and replace with same model of new element. be sure to replace the screw. 10. lay the new element into the frame. Center it and then tighten the four screws to hold it in place. Be careful not to knock off, puncture or lose the four insulating pads on the element wrap. NOTE: the four pads MUST be put back in this step! Figure 4 - Element in frame with lead wires connected. 11. Attach the high-temperature lead wires using the hardware that was removed from the used element. Follow the appropriate wiring schematic on page Carefully slide the element frame back into the heater. the lead wires must be carefully pulled back through the mounting stub as the element is slid into place (leaving them loose in the heater housing can cause them to overheat). (Figure 1) 13. replace the two allen screws that hold the element frame in place. (Figure 2) four screws hold element Figure 5 - Lead wires disconnected from element. 14. Using a resistance meter, check for element continuity and shorts to ground. the resistance from a hot lead to ground should be several mega-ohms, and the resistance between hot leads should be between 10 and 50 ohms, depending on the element. 15. re-attach the heater to the mount using the hardware removed in Step 2. Connect the heater to electrical supply and test for operation. 10

11 HZS Series Mounting Options HZS SERIES MOUNTINg OPTIONS HZS Series heaters come complete with an adjustable universal mounting tab that can be used in many ways. it may have to be removed and rotated for some installations. it has been designed to fit a variety of electrical junction boxes. A B C Universal mounting tab - standard attachment to post or wall with remote electrical connection. Hang the heater directly from an electrical junction box with emt connected with compression fittings. Attach the emt to the bracket securely. if feeding wire in wet locations, allow room at the end of the pipe for the flex junction. A 20 bend in the last 8-12" of the emt gives a "pendant" style look to the installation. the junction box must be on the bottom side. For horizontal mounting to a flat surface, a single bolt placed in one of the middle holes allows for left/right adjustment. A refer to CLEARANCE TO COMBUSTIBLES for more information. B warning To prevent a possible fire and to increase the life of the heater, always install heater with the junction box on the low side. Failure to mount the heater with the junction box on the low side may void the warranty. NOTE: the in-ceiling bezel mount is no longer recommended because it positions the junction box beside, not below, the heater. C HZS Series Electrical Connection All wiring must be in accordance with the national and local electrical Codes. the heater housing must be properly grounded. install circuit protection for each heater or bank of heaters as required. ** Always be sure the supply voltage is turned off to the junction box before starting installation. ** 1. Connect the service to the heater with properly sized wires, connectors and wire nuts rated for 90 C (194 F). 2. Use waterproof conduit or flex if installed outdoors or in wet areas as needed. 3. Attach grounding wire to the green screw in the bottom of the junction box. 4. Connect service to the high temp wires according to the appropriate wiring schematic on page Junction box has 17.3 cubic inches (112 cubic centimeters) of wiring space and a 1/2" threaded hole. 6. Supply heater control equipment as required to turn heaters on and off, to allow each heater to be staged for low/high voltage operation, to be dimmed, or to be controlled by sensors or timers. 7. be sure you are supplying the correct voltage to the heater, allowing for line losses. the heater's voltage requirements are marked on its shipping box and on its etl certification label. Too much voltage will burn the heater element out immediately. Too little voltage or inadequate current capacity will cause the heater element to run cool, and can cause the supply circuit to overheat dangerously. 11

12 HZS Series Angle Adjustment the angle of the heater can be adjusted up and down. there are two adjustment screws, one on either side of the mounting bracket. be sure to loosen them before moving the heater, and then tighten them evenly to hold it at the desired angle. Outer Side of Bracket Inner Side of Bracket HZS Series Element Replacement HZS SERIES ELEMENT REPLACEMENT Lid Always disconnect the heater from the main electrical supply during installation and/or replacement of the heater element. Support Bracket (2x) 1. turn off the supply power at the panel. 2. disconnect and dismount the heater. 3. remove the lid. Enclosure Head Wrap Ring Terminals Element 4. remove the nut and bolt from the ring terminals on the back of the element. 5. remove the screws that fasten support brackets to enclosure (if necessary). 6. Pull the head wrap, element and support brackets out of the enclosure just enough to expose the screws on the side of the head wrap. Wire Hold-down 7. remove the support brackets from the head wrap and remove the top two screws on the head wrap allowing the old element to be pushed out and replaced by the new element. 8. Push the new element tight to the face of the head wrap and replace the top two screws. Electrical Box Cover 9. Set the head wrap with the support brackets into the enclosure and pull the excess wire back through the electrical box and secure with clamp. Position the support brackets on each side of enclosure and replace and tighten the two screws. 10. re-install the nut and bolt into ring terminals. 11. Place lid onto enclosure and tighten screws. 12. Place on the electrical box cover and tighten screws. 13. re-connect and re-mount the unit. 14. test unit. 12

13 HZE & HZS Series Maintenance and Troubleshooting MAINTENANCE the heater body can be washed with gentle detergent and a soft wash cloth. Do not use a pressure washer. With an air hose regulated to 30 psi, blow off any dust and dirt from in front of the heater that has accumulated on the reflective surfaces of the heater and reflective lens. A vacuum cleaner can be used as well. Accumulated dirt will degrade performance. blow off or vacuum any accumulated dirt on the vent holes of the heater and make sure they are not bent such that the vent area is reduced. When not installed or in use, store the heater in a dry, dust-free place and be sure the lens assembly is protected from any possible damage. the heater lens is manufactured from thin aluminum and is easily bent and damaged. Heater performance deteriorates when the lens is bent or damaged. in most cases the lens can be bent back into shape by hand or with pliers. if the heater is turned on when wet it may steam and sizzle a bit but this will subside as it dries. replacement high-temperature lead wires must be capable of handling 1000º F and have stainless steel terminals. TO CHANgE THE COLOR Of THE HEATER the outer housing of the heater can be spray painted with high-temp metal paint. DO NOT paint the bare aluminum lens or inside surfaces. (the bare aluminum reflects 100% of the infrared heat; paint absorbs infrared and will cause the unit to overheat. This will void the warranty.) TROUBLESHOOTINg At full power and after two to three minutes of warm-up time, the heater element should glow a warm orange color, similar to the color of coals in a hot fire. If the element does not warm up at all: is the service power on at the circuit breaker? is there a switch or dimmer in the circuit? is the switch on? is the heater connected to the appropriate power source (plug or junction box)? is the element in working condition? burned out elements normally have visible burn marks on the face of the element. if there is no evidence of damage, and you still suspect the element, turn off the power at the circuit breaker, disconnect the service power and check element resistance. it should be between 10 and 50 ohms, depending on the element. Are the high temperature leads connected to the element? turn off the power at the circuit breaker. remove the element from the heater housing and check the connections at the back of the element. If the element barely glows: is the heater on a dimmer? is the dimmer turned full on and operating correctly? is the heater connected to the correct line voltage (under load condition) for its element type? 120V models must be plugged into an outlet that provides 120V. if the outlet provides less than 120V the element will not operate correctly. is the element wired correctly, and are all connections intact? note: three phase devices where one leg is disconnected will operate with reduced output. If the element glows a bright orange-white and heats up very quickly: The heater is receiving too much power and will burn out very quickly if it is not turned off. is the heater wired correctly for its element type? is the element damaged? A short circuit between adjacent coils will cause some coils to go dark and some coils to overheat. damaged elements cannot be repaired and must be replaced. 13

14 HZE & HZS Series Replacement Elements Power No. of No. of Voltage Alt. Voltage Element Heater (w) Stages wires Schem. (V) Schem. (V) 7501 HZRE15120C HZX A HZRE15208C HZX A* HZRE15240C HZX A* HZRE15277C HZX A HZRE30120/240C HZX30120/ B 120 B' HZRE30208C HZX B* 208 HZRE30208AC HZX30208A A* HZRE30208YC HZX30208Y C 208 (1) HZRE30208DC HZX30208D D HZRE30240/480C HZX30240/ B* 240 B' HZRE30277C HZX A HZRE30480C HZX A* HZRE50120C HZX C HZRE50208SC HZX B* HZRE50208YC HZX50208Y C 208 (1) HZRE50208DC HZX50208D D HZRE50240/480C HZX50240/ B* 240 B' HZRE50277C HZX B HZRE50346C HZX A HZRE50480YC HZX50480Y C 480 (2) HZRE50600C HZX A* 600 NOTES: All heaters have a ground wire attached to the heater shell (not the element). Alternate connections for dual service elements are under "Alternate Schematic". Schematics with an asterisk (A*, b*) connect to a common hot wire (H), not a neutral wire (n). Schematics with an apostrophe (b') require the neutral wire (n) to be capped. Heater elements and wiring schematics that allow high/low staging are shaded. (1) Voltage between hot and neutral is 120V. (2) Voltage between hot and neutral is 277V. 14

15 HZE & HZS Series Calculating Current Requirement CALCULATINg CURRENT REQUIREMENT Questions about sizing wire and circuit breakers should be directed to a qualified electrician. Single Phase Power and Single Stage Elements (Element wiring Schematics A, A* and B') CURRENT = POwER / VOLTAgE example: to find the operating current for a 1500 watt heater that operates at 120 volts, divide 1500 watts by 120 volts to get current of 12.5 amps. Single Phase Power and Multi-Stage Elements (Element wiring Schematics B, B* and C) HEATER CURRENT = POwER / VOLTAgE STAgE CURRENT = HEATER CURRENT / (# of STAgES) example: to find the operating current for each stage of a 2-stage, 3000 watt heater operating at 120 volts, divide 3000 watts by 120 volts to get heater current of 25 amps. to get individual stage current, divide heater current by # of stages (2) to get 12.5 amps per stage. Single Phase Power and Dual Voltage Elements (Element wiring Schematics B, B* and B') dual voltage elements have multiple stages that can be wired to permit operation at different voltages. the low voltage configuration would be treated as a multi-stage heater described in the paragraph above. to wire the same element in a high voltage application would require wiring the stages in series (as shown in element Wiring Schematic b'). to determine the current draw for dual voltage HotZone electric heaters when wired for high voltage use the formula: HEATER CURRENT = POwER / VOLTAgE As the stages are in series, STAgE CURRENT = HEATER CURRENT 3-Phase Power and Multi-Stage Elements Delta Configuration (Element wiring Schematic D) LEg CURRENT = POwER / (VOLTAgE x # of STAgES) example: A 3-stage 5000 watt heater that runs on a 208 volt 3-phase supply and is wired in a delta configuration. to find the current in each leg of the 3-phase supply, divide 5000 watts by the product of 208 volts and the number of stages, which is 3. the resulting current in each leg would be 8 amps. 3-Phase Power and Multi-Stage Elements wye Configuration (Element wiring Schematic C) LEg CURRENT = POwER / (( VOLTS / 3 ) x # of STAgES) example: A 3-stage 5000 watt heater that runs on a 208 volt 3-phase supply and is wired in a Wye configuration. to find the current in each leg of the 3-phase supply divide 5000 watts by the product of 208 volts divided by the square root of 3 times the number of stages which is 3. the resulting current in each leg would be 13.9 amps. 15

16 Warranty Schaefer Ventilation Equipment, LLC Schaefer Limited warranty Policy Schaefer Ventilation Equipment, LLC (SVE) provides the following limited warranty from the date of invoice to the initial purchaser of our products or to its customer with a dated proof of purchase: I. Two-year coverage (unless otherwise indicated below) applies to all products, components and assemblies provided by SVE that prove to be defective in material or workmanship. Any such defective product will be repaired or replaced at SVE s option, with the defective product or component returned, upon approval, to SVE, F.O.B Sauk Rapids, Minnesota. II. This warranty does not cover: a. Failure, damage or malfunction as a result of: i. Improper installation or installation not in accordance with installation instructions. ii. Operating conditions that vary from SVE s operating instructions. iii. Misuse, abuse, negligence, alteration, or accident. iv. Transporting the product. v. Improper operation or lack of appropriate or regular maintenance of the product. b. Loss of time, inconvenience, loss of use of the product or other consequential or incidental damages. c. Parts that need replacement due to normal wear and tear. d. Superficial or cosmetic rust or corrosion. e. Any product whose name plate has been removed. Products with warranty periods that differ from the standard 2-year warranty are as follows: Poly Housings 25 years Fiberglass Housings 15 years Low-intensity Tube Heater Exchange Tubes 5 years Heavy-Duty Industrial Wash-Down Fans (with VWD motors) 3 years K-Series, 2-Stage, Compact and Stainless Steel Tube Heaters 1 year Quartz and Zubri Heaters 1 year Big Dog Fans 1 year Shutter Motors and Aluminum Riveted Fan Blades 1 year Epoxy Line Wash down fans (with EWD motors) 1 year Evaporative Cooling Pads 180 days HotZone Electric Elements 120 days Quartz Bulbs 90 days Tuff & Gusty Fans 90 days Any product or part as noted as an exception to the standard 2-year warranty in the product s operating manual. SVE reserves the right to add or delete products from this exception list at any time. THERE ARE NO WARRANTIES OF MERCHANTABILITY OR FITNESS OF USE. SVE reserves the right to change product design and specification without prior notice or liability. The above constitutes the sole warranty offered by Schaefer Ventilation Equipment, LLC. Effective March 1, All information, illustrations and specifications in these instructions are based on the latest product information available at the time of printing. Product specifications subject to change Schaefer Ventilation Equipment / M-HZELECTRIC